6. Why do objects like kitchen sponges and wood float on water?
Because they are
A heavier
C. cheap and easy to buy
B. less dense
D. all of these
7. Ships are heavy but they are shaped so that they push aside lots of water. The
water pushes back hard enough to keep them floating. How do we call the force
of water pushing back on ships?
A bouyancy
B. gravity
C. upthrust D. weight
8. Which group of materials has the ability to undergo decay?
A Bread, cow manure, fish bone
B. Medicine bottle, rubber tire, soft drink can
C. Busted fluorescent tube, plastic bag, PVC pipe
D. Empty milk can, plastic drinking straw, nylon rope
9. Which of the following materials can be recycled?
A. plastic bottles
C. takeaway juice cups
B. used syringes
D. disposable face mask
10. Why we must use non-biodegradable materials wisely? They
A are durable
B. can withstand high temperature
C. do not decay when thrown away
D. decompose or break down naturally
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Answer:
Explanation:
6:B
7:D
8:A
9:A
10:D
Answer:
ha ma na ba na ba ha jooh naaa na